From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/gpu/drm/panel/panel-lvds.c | 260 +++++++++++++++++++++++++++++++++++++
 1 file changed, 260 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-lvds.c

(limited to 'drivers/gpu/drm/panel/panel-lvds.c')

diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c
new file mode 100644
index 0000000000..1b8e315691
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-lvds.c
@@ -0,0 +1,260 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Generic LVDS panel driver
+ *
+ * Copyright (C) 2016 Laurent Pinchart
+ * Copyright (C) 2016 Renesas Electronics Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+#include <video/display_timing.h>
+#include <video/of_display_timing.h>
+#include <video/videomode.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+
+struct panel_lvds {
+	struct drm_panel panel;
+	struct device *dev;
+
+	const char *label;
+	unsigned int width;
+	unsigned int height;
+	struct drm_display_mode dmode;
+	u32 bus_flags;
+	unsigned int bus_format;
+
+	struct regulator *supply;
+
+	struct gpio_desc *enable_gpio;
+	struct gpio_desc *reset_gpio;
+
+	enum drm_panel_orientation orientation;
+};
+
+static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel)
+{
+	return container_of(panel, struct panel_lvds, panel);
+}
+
+static int panel_lvds_unprepare(struct drm_panel *panel)
+{
+	struct panel_lvds *lvds = to_panel_lvds(panel);
+
+	if (lvds->enable_gpio)
+		gpiod_set_value_cansleep(lvds->enable_gpio, 0);
+
+	if (lvds->supply)
+		regulator_disable(lvds->supply);
+
+	return 0;
+}
+
+static int panel_lvds_prepare(struct drm_panel *panel)
+{
+	struct panel_lvds *lvds = to_panel_lvds(panel);
+
+	if (lvds->supply) {
+		int err;
+
+		err = regulator_enable(lvds->supply);
+		if (err < 0) {
+			dev_err(lvds->dev, "failed to enable supply: %d\n",
+				err);
+			return err;
+		}
+	}
+
+	if (lvds->enable_gpio)
+		gpiod_set_value_cansleep(lvds->enable_gpio, 1);
+
+	return 0;
+}
+
+static int panel_lvds_get_modes(struct drm_panel *panel,
+				struct drm_connector *connector)
+{
+	struct panel_lvds *lvds = to_panel_lvds(panel);
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &lvds->dmode);
+	if (!mode)
+		return 0;
+
+	mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	drm_mode_probed_add(connector, mode);
+
+	connector->display_info.width_mm = lvds->dmode.width_mm;
+	connector->display_info.height_mm = lvds->dmode.height_mm;
+	drm_display_info_set_bus_formats(&connector->display_info,
+					 &lvds->bus_format, 1);
+	connector->display_info.bus_flags = lvds->bus_flags;
+
+	/*
+	 * TODO: Remove once all drm drivers call
+	 * drm_connector_set_orientation_from_panel()
+	 */
+	drm_connector_set_panel_orientation(connector, lvds->orientation);
+
+	return 1;
+}
+
+static enum drm_panel_orientation panel_lvds_get_orientation(struct drm_panel *panel)
+{
+	struct panel_lvds *lvds = to_panel_lvds(panel);
+
+	return lvds->orientation;
+}
+
+static const struct drm_panel_funcs panel_lvds_funcs = {
+	.unprepare = panel_lvds_unprepare,
+	.prepare = panel_lvds_prepare,
+	.get_modes = panel_lvds_get_modes,
+	.get_orientation = panel_lvds_get_orientation,
+};
+
+static int panel_lvds_parse_dt(struct panel_lvds *lvds)
+{
+	struct device_node *np = lvds->dev->of_node;
+	int ret;
+
+	ret = of_drm_get_panel_orientation(np, &lvds->orientation);
+	if (ret < 0) {
+		dev_err(lvds->dev, "%pOF: failed to get orientation %d\n", np, ret);
+		return ret;
+	}
+
+	ret = of_get_drm_panel_display_mode(np, &lvds->dmode, &lvds->bus_flags);
+	if (ret < 0) {
+		dev_err(lvds->dev, "%pOF: problems parsing panel-timing (%d)\n",
+			np, ret);
+		return ret;
+	}
+
+	of_property_read_string(np, "label", &lvds->label);
+
+	ret = drm_of_lvds_get_data_mapping(np);
+	if (ret < 0) {
+		dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
+			np, "data-mapping");
+		return ret;
+	}
+
+	lvds->bus_format = ret;
+
+	lvds->bus_flags |= of_property_read_bool(np, "data-mirror") ?
+			   DRM_BUS_FLAG_DATA_LSB_TO_MSB :
+			   DRM_BUS_FLAG_DATA_MSB_TO_LSB;
+
+	return 0;
+}
+
+static int panel_lvds_probe(struct platform_device *pdev)
+{
+	struct panel_lvds *lvds;
+	int ret;
+
+	lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
+	if (!lvds)
+		return -ENOMEM;
+
+	lvds->dev = &pdev->dev;
+
+	ret = panel_lvds_parse_dt(lvds);
+	if (ret < 0)
+		return ret;
+
+	lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
+	if (IS_ERR(lvds->supply)) {
+		ret = PTR_ERR(lvds->supply);
+
+		if (ret != -ENODEV) {
+			if (ret != -EPROBE_DEFER)
+				dev_err(lvds->dev, "failed to request regulator: %d\n",
+					ret);
+			return ret;
+		}
+
+		lvds->supply = NULL;
+	}
+
+	/* Get GPIOs and backlight controller. */
+	lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
+						     GPIOD_OUT_LOW);
+	if (IS_ERR(lvds->enable_gpio)) {
+		ret = PTR_ERR(lvds->enable_gpio);
+		dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
+			"enable", ret);
+		return ret;
+	}
+
+	lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset",
+						     GPIOD_OUT_HIGH);
+	if (IS_ERR(lvds->reset_gpio)) {
+		ret = PTR_ERR(lvds->reset_gpio);
+		dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
+			"reset", ret);
+		return ret;
+	}
+
+	/*
+	 * TODO: Handle all power supplies specified in the DT node in a generic
+	 * way for panels that don't care about power supply ordering. LVDS
+	 * panels that require a specific power sequence will need a dedicated
+	 * driver.
+	 */
+
+	/* Register the panel. */
+	drm_panel_init(&lvds->panel, lvds->dev, &panel_lvds_funcs,
+		       DRM_MODE_CONNECTOR_LVDS);
+
+	ret = drm_panel_of_backlight(&lvds->panel);
+	if (ret)
+		return ret;
+
+	drm_panel_add(&lvds->panel);
+
+	dev_set_drvdata(lvds->dev, lvds);
+	return 0;
+}
+
+static void panel_lvds_remove(struct platform_device *pdev)
+{
+	struct panel_lvds *lvds = platform_get_drvdata(pdev);
+
+	drm_panel_remove(&lvds->panel);
+
+	drm_panel_disable(&lvds->panel);
+}
+
+static const struct of_device_id panel_lvds_of_table[] = {
+	{ .compatible = "panel-lvds", },
+	{ /* Sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, panel_lvds_of_table);
+
+static struct platform_driver panel_lvds_driver = {
+	.probe		= panel_lvds_probe,
+	.remove_new	= panel_lvds_remove,
+	.driver		= {
+		.name	= "panel-lvds",
+		.of_match_table = panel_lvds_of_table,
+	},
+};
+
+module_platform_driver(panel_lvds_driver);
+
+MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
+MODULE_DESCRIPTION("LVDS Panel Driver");
+MODULE_LICENSE("GPL");
-- 
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